84212190 under HS Code CENTRIFUGES, INCLUDING CENTRIFUGAL DRYERS; FILTERING OR PURIFYING MACHINERY AND APPARATUS, FOR LIQUIDS OR GASES - - FILTERING OR PURIFYING MACHINERY AND APPARATUS FOR LIQUIDS - FOR FILTERING OR PURIFYING WATER : OTHER and 84818090 under HS Code TAPS, COCKS, VALVES AND SIMILAR APPLIANCES FOR PIPES, BOILER SHELLS, TANKS, VATS OR THE LIKE, INCLUDING PRESSURE-REDUCING VALVES AND THERMOSTATICALLY CONTROLLED VALVES - OTHER APPLIANCES: OTHER were the top imported HS Codes by WATER SYSTEM ENGINEERING SERVICES in 2021.